I was reading about quantum computing and I came across this: http://en.wikipedia.org/wiki/Quantum_computing#Quantum_decoherence It seems to suggest that fast logic gates dont decoher qubits while slow ones due. If this is true, it would seem like the term "measurement" in QM is a function of time. I might have misunderstood this but it seems like slow logic gates act as "measurements" while fast ones dont. I dont see any difference between sending a qubit through a logic gate and bouncing a photon off of it (or some other form of measurement). Does this mean that if you could measure a qubit fast enough it wouldnt decoher??